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AP Chemistry Name _________________________________ Period ___ Date __/__/__ Unit 2 Chemical Reactions Oxidation Numbers & RedOx 54. Determine the oxidation number of each element in the following ions or compounds: a) BrO3Br: +5/O: -2 d) CaH2 Ca: +2/H: -1 2 b) C2O4 C: +3/O: -2 e) H2SiO4 H: +1/Si: +6/O: -2 2 c) F2 F: 0 f) SO4 S: +6/O: -2 55. Determine the oxidation number of each element in the following ions or compounds: a) SF6 d) N2O4 b) H2AsO4 e) PCl4+ c) UO2+ 56. 57. 58. 59. f) XeO42 Which of the following reactions is (are) oxidation-reduction reactions? Explain your answer briefly. classify the remaining reactions. a) Zn(s) + 2 NO3(aq) + 4 H+(aq) Zn2+(aq) + 2 NO2(g) + 2 H2O(l) This is a redox rxn; Zn changes ox state from 0 to +2 and N changes from +5 to +4 b) Zn(OH)2(s) + H2SO4(aq) ZnSO4(aq) + 2 H2O(l) This is a double replacement reaction. c) Ca(s) + 2 H2O(l) Ca(OH)2(s) + H2(g) This is a redox rxn; Ca changes ox state from 0 to +2 and H changes from +1 to 0 Which of the following reactions is (are) oxidation-reduction reactions? Explain your answer briefly. classify the remaining reactions. a) CdCl2(aq) + Na2S(aq) CdS(s) + 2 NaCl(aq) b) 2 Ca(s) + O2(g) 2 CaO(s) c) Ca(OH)2(s) + 2 HCl(aq) CaCl2(aq) + 2 H2O(l) In each of the following reactions, decide which reactant is oxidized and which is reduced. Designate the oxidizing agent and reducing agent. a) 2 Mg(s) + O2(g) 2 MgO(s) Mg is oxidized and is the reducing agent; O is reduced and is the oxidizing agent b) C2H4(g) + 3 O2(g) 2 CO2(g) + 2 H2O(g) C is oxidized and is the reducing agent; O is reduced and is the oxidizing agent c) Si(s) + 2 Cl2(g) SiCl4(l) Si is oxidized and is the reducing agent; Cl is reduced and is the oxidizing agent In each of the following reactions, decide which reactant is oxidized and which is reduced. Designate the oxidizing agent and reducing agent. a) Ca(s) + 2 HCl(aq) CaCl2(aq) + H2(g) b) Cr2O7(aq) + 3 Sn2+(aq) + 14 H+(aq) 2 Cr3+(aq) + 3 Sn4+(aq) + 7 H2O(l) c) FeS(s) + 3 NO3(aq) + 4 H+(aq) 3 NO(g) + SO42(aq) + Fe3+(aq) + 2 H2O(l)